Basell Poliolefine Italia S.r.l.

Basell Poliolefine Italia, S.p.a.

Basell Polyolefine Gmbh

Daniele Bigiavi

Maria Silvia Tonti

Luigi Resconi

Giampaolo Pellegatti

Massimo Covezzi

Pietro Baita

Simona Guidotti

Gianni Vitale

Gabriele Mei

Anna Fait

Giuseppe Penzo

Nicolò Arich De Finetti

Rita Martelli

Giampiero Morini

Fabrizio Piemontesi

Anteo Pelliconi

Stefano Spataro

Enea Garagnani

Guiseppe Penzo

Nicolo' Arich De Finetti

Films especially suitable for the packaging of fresh foodstuff, like salad and vegetables, due to their high permeability to oxygen, carbon dioxide and water vapor, are obtained from polyolefin composition comprising (percentage by weight):

Process compositions and permeable films therefrom

A solution process for polymerizing one or more &#x3b1;-olefins of formula CH&#x2550;CHR, where R is H or an alkyl radical C, to produce a polyolefin soluble in the reaction medium, the process comprising: a) polymerizing said one or more &#x3b1;-olefins in a solution phase in the presence of a polymerization catalyst and a inert solvent having a vapor pressure lower than 100 kPa at 20&#xb0; C.; b) separating the produced polyolefin from the unreacted monomers and the inert solvent by means of a sequence of at least three volatilization chambers operating at a decreasing pressure, the second devolatilization chamber being operated at a pressure from 0.8 to 5 bar.

Solution polymerization process for preparing polyolefins

A 1-butene/propylene copolymer composition having a content of propylene derived units from 1 to 4% by weight, wherein at least 50% of the crystalline polymer is present in the thermodynamically stable, trigonal Form I (detected by DSC analysis) after 100 hours of the first melting at room temperature comprising:

1-butene propylene copolymer compositions

A 1-butene/propylene copolymer composition having a content of propylene derived units from 4 to 10% by weight, wherein at least 50% of the polymer is present in the thermodynamically stable, trigonal form I after 100 hours at room temperature, said composition comprising:

A process for preparing polyolefin blends comprising: a) polymerizing in a solution phase propylene or 1-butene to prepare a polymeric solution containing a semicrystalline polymer component; b) polymerizing in a solution phase 1-hexene or 1-octene to prepare a polymeric solution containing an amorphous polymer component; c) mixing the polymeric solutions obtained from steps a) and b); d) subjecting the mixture of step c) to a devolatilization step to separate a polyolefin blend comprising a semicrystalline component and an amorphous component; the polymerization steps a) and b) being carried out in two polymerization reactors connected in parallel.

Polymerization process for preparing polyolefin blends

The present invention relates to butene-1 copolymers containing up to 40% by mol of ethylene and/or propylene derived characterized by the following properties: d) Product of the reactivity ratios r1&#xb7;r2&#x2266;2; e) Content of butene-1 units in form of isotactic pentads (mmmm)&#x3e;98%; and f) absence of 4,1 insertions of butene units.

Butene-1 copolymers and process for their preparation

A solution process for polymerizing one or more &#x3b1;-olefins of the formula CH&#x2550;CHR, where R is H or an alkyl radical C-C, to produce a polymer that is soluble in the reaction medium, comprising the steps of:

Liquid phase process for polymerizing olefins

Method for continuously removing the unreacted butene-1, and optionally other volatile components, from a polymeric solution obtained by liquid phase (co)polymerization of butene-1, the method comprising the steps of: subjecting the polymeric solution to heating and mixing conditions such that a mixture is formed consisting substantially of: (1) a polybutene melt containing entrapped butene-1 and (2) supercritical gaseous butene-1; subjecting the above mixture to a sequence of devolatilization steps operating at decreasing pressures.

Method for removing volatile components from polymer compositions

A liquid-phase process for polymerizing &#x3b1;-olefins of the formula CH&#x2550;CHR, where R is H or an alkyl radical C1&#x2013;C6, to produce a polymer that is soluble in the reaction medium, comprising the steps of: a) continuously polymerizing in liquid phase the &#x3b1;-olefin in the presence of a catalyst system based on a transition metal compound; b) continuously withdrawing from step a) a solution of polymer in the liquid reaction medium; c) mixing in one or more mixing stages said solution of polymer in the reaction medium with an organic deactivator having: at least a hydroxy group, a boiling point higher than 150&#xb0; C., and a ratio between the molecular weight (MW) and the number of hydroxy groups (OH) comprised between 20 and 100.

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Bologna, Italy

Daniele Bigiavi